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通过负压铸渗工艺在ZG45表面获得与其结合良好的厚5 mm的耐磨镍基渗层,对渗层的相进行了分析。用THT-2000型摩擦试验机,对比考察了镍基合金渗层与铸钢基体在不同温度下的摩擦磨损性。结果表明,铸钢基体和渗层的摩擦系数都随温度的升高而降低,同一温度下渗层的摩擦系数小于铸钢基体,这主要是由于温度升高改变了材料表面的属性,以及氧参与摩擦改变了摩擦系统的摩擦性质。在不同温度下镍基渗层的耐磨性要优于ZG45基体的,室温时最为显著,其磨损量是基体磨损量的1/3。渗层的存在提高了材料的耐磨性,起到了保护基体的作用。镍基渗层的磨损机制主要受氧化和粘着磨损控制。
Through the negative pressure casting and infiltration process, a 5 mm thick wear-resistant Ni-based infiltrated layer was obtained on the ZG45 surface, and the phase of the infiltrated layer was analyzed. THT-2000 type friction tester was used to compare the friction and wear properties between the nickel-based alloy layer and the cast steel substrate at different temperatures. The results show that the friction coefficient of the cast steel substrate and the infiltrated layer both decrease with the increase of the temperature. The friction coefficient of the infiltrated layer at the same temperature is lower than that of the cast steel base, which is mainly due to the change of the surface property of the material due to the temperature increase, Participation in friction changes the frictional properties of the friction system. At different temperatures, the wear resistance of nickel-base infiltration layer is better than that of ZG45, which is the most obvious at room temperature. The wear amount is 1/3 of the wear amount of substrate. The existence of the permeable layer improves the wear resistance of the material and plays a role of protecting the substrate. The wear mechanism of nickel base infiltration layer is mainly controlled by oxidation and adhesive wear.